| 摘要 |
PROBLEM TO BE SOLVED: To provide an alkali storage battery with excellent cycle life at high temperature without lowering charging and discharging efficiency and charging capacity. SOLUTION: As the method of manufacturing the alkali storage battery, at first, the alkali storage battery is charged with a charging current of 0.1C at room temperature (about 25 deg.C) so that it becomes more than 80% of cathode capacity, and after a prescribed period of resting time at 40-80 deg.C, the alkali storage battery is made to discharge with the discharging current equivalent to 0.2C at 40-80 deg.C by connecting a resistor or by impressing a constant current. In this case, discharged capacity is controlled so that the off-load voltage becomes 1.15-1.25 V 30 minutes after the stoppage of discharge. Thus, by making the off-load voltage after initial discharge higher than 1.15 V, reduction of a cobalt compound is restrained, and a higher-order cobalt compound can be stabilized, and deterioration of cycle capacity at high temperature can be restrained. |
